Dresden 2017 – scientific programme

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 46: Organic Thin Films II (joint session CPP/DS/HL, organized by DS)

CPP 46.8: Talk

Wednesday, March 22, 2017, 16:45–17:00, CHE 91

Superradiance from two dimensional brick-wall aggregates of dye molecules: the role of size and shape for the temperature dependence — •Alexander Eisfeld¹, Christian Marquardt², and Moritz Sokolowski² — ¹MPI-PKS — ²Uni Bonn

Aggregates of interacting molecules can exhibit electronically excited states which are coherently delocalized over many molecules. This can lead to a strong enhancement of the fluorescence decay rate which is referred to as superradiance (SR). To date, the temperature dependence of SR is described by a 1/T law. Using an epitaxial dye layer and a Frenkel-exciton based model we provide both experimental and theoretical evidence that significant deviations from the 1/T behaviour can occur for brickwall-type aggregates of finite size leading even to a maximum of the SR at finite temperature. This is due to the presence of low energy excitations of weak or zero transition strength.